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12.) The wavelength of a light wave having a frequency of 100,000,000

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12.) The wavelength of a light wave having a frequency of 100,000,000
Hz is ____ meters. Only enter your numerical answer below – do not include units. Report your answer to 2 decimal places.

13.) A distant exoplanet’s temperature is found to be about 260 Kelvin. This means it radiates most strongly at a wavelength of ____ nm. Only enter your numerical answer below – do not include units.

14.) The observed wavelength of a spectral line from a nearby star is 3.33 x 10^-7 m. This spectral line should have a wavelength of 3.77 x 10^-7 m. Therefore this star has a velocity of ____ km/s. Only enter your numerical answer below – do not include units. If your answer is negative, be certain to include a minus sign in your answer.

15.) A star that has a parallax of 0.035 arcseconds is _____ light-years away from the Earth. Only enter your numerical answer below – do not include units. Report your answer to 2 decimal places.

16.) The luminosity of a star with a radius of (6.20×10^6) meters and a surface temperature of 30,000 Kelvin is ______ Watts. Only enter your numerical answer below – do not include units. Report your answer to 2 decimal places using scientific notation in the textboxes below. Only one number should be to the left of the decimal point! n.nn x 10^n

 
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